I have a converted GM 4101 coach with the original 671 diesel and gear driven generator. My generator has a shorted field coil so I was thinking of switching to a high capacity alternator to charge the bus batteries and provide power for over-the-road a/c. Does anyone know of a source for an alternator that would work for this purpose? I would like to find one that can be gear driven like my existing generator rather than belt driven, if possible. Thanks for your help.Bob Green